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bytes
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type
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293
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Character encodings
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sindex(t, start, end) sisalnum() sisalpha() sisdecimal() sisdigit()
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Identi ers and keywords 51
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sisidentifier() sislower()
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Table 29 String Methods #2
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2 Data Types
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Syntax sisnumeric() sisprintable() sisspace() sistitle() sisupper()
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Description
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Returns True if s is nonempty and every character in s is a numeric Unicode character such as a digit or fraction Returns True if s is empty or if every character in s is considered to be printable, including space, but not newline Returns True if s is nonempty and every character in s is a whitespace character Returns True if s is a nonempty title-cased string; see also strtitle() Returns True if str s has at least one uppercaseable character and all its uppercaseable characters are uppercase; see also strislower() Returns the concatenation of every item in the sequence seq, with str s (which may be empty) between each one Returns a copy of s left-aligned in a string of length width padded with spaces or optionally with char (a string of length 1) Use strrjust() to right-align and strcenter() to center See also strformat() Returns a lowercased copy of s; see also strupper() Companion of strtranslate(); see text for details Returns a tuple of three strings the part of str s before the leftmost str t, t, and the part of s after t; or if t isn t in s returns s and two empty strings Use strrpartition() to partition on the rightmost occurrence of t Returns a copy of s with every (or a maximum of n if given) occurrences of str t replaced with str u Returns a list of strings splitting at most n times on str t; if n isn t given, splits as many times as possible; if t isn t given, splits on whitespace Use strrsplit() to split from the right this makes a difference only if n is given and is less than the maximum number of splits possible Returns the list of lines produced by splitting s on line terminators, stripping the terminators unless f is True Returns True if s (or the start:end slice of s) starts with str x or with any of the strings in tuple x; otherwise, returns False See also strendswith()
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sjoin(seq) sljust( width, char) slower() smaketrans() spartition( t)
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sreplace(t, u, n) ssplit(t, n)
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ssplitlines( f) sstartswith( x, start, end)
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Strings
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Syntax sstrip(chars)
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Description
Returns a copy of s with leading and trailing whitespace (or the characters in str chars) removed; strlstrip() strips only at the start, and strrstrip() strips only at the end Returns a copy of s with uppercase characters lowercased and lowercase characters uppercased; see also strlower() and strupper() Returns a copy of s where the rst letter of each word is uppercased and all other letters are lowercased; see
stristitle()
sswapcase()
stitle()
stranslate() supper() szfill(w)
Companion of strmaketrans(); see text for details Returns an uppercased copy of s; see also strlower() Returns a copy of s, which if shorter than w is padded with leading zeros to make it w characters long
Which search method we use is purely a matter of taste and circumstance, although if we are looking for multiple index positions, using the strindex() method often produces cleaner code, as the following two equivalent functions illustrate:
def extract_from_tag(tag, line): def extract_from_tag(tag, line): opener = "<" + tag + ">" opener = "<" + tag + ">" closer = "</" + tag + ">" closer = "</" + tag + ">" try: i = linefind(opener) i = lineindex(opener) if i != -1: start = i + len(opener) start = i + len(opener) j = lineindex(closer, start) j = linefind(closer, start) return line[start:j] if j != -1: except ValueError: return line[start:j] return None return None
Both versions of the extract_from_tag() function have exactly the same behavior For example, extract_from_tag("red", "what a <red>rose</red> this is") returns the string rose The exception-handling version on the left separates out the code that does what we want from the code that handles errors, and the error return value version on the right intersperses what we want with error handling The methods strcount(), strendswith(), strfind(), strrfind(), strindex(), strrindex(), and strstartswith() all accept up to two optional arguments: a start position and an end position Here are a couple of equivalences to put this in context, assuming that s is a string:
scount("m", 6) == s[6:]count("m") scount("m", 5, -3) == s[5:-3]count("m")